Specification Test Results

• pKa (25 °C):
  (1) 2.15, (2) 6.82, (3) 12.38 (phosphoric acid)
• Assay:
  Min. 99.0 %
• pH (5 %, 25 °C):
  8.7 - 9.3
• Loss on drying (105°C):
  Max. 0.2 %
• Water insoluble matter:
  Max. 0.01 %
• Iron (Fe):
  Max. 20 ppm
• Heavy metals (as Pb):
  Max. 0.001 %
• Chloride (Cl):
  Max. 20 ppm
• Sulfate (SO₄):
  Max. 50 ppm